61) The velocity of steam at throat of the nozzle is __________ the velocity of sound.

62) The critical pressure ratio for initially dry saturated steam is

63) The discharge through a nozzle is maximum for a certain value of exit pressure. This pressure is known as critical pressure.

64) The velocity of steam, in reaction turbines, is increased in the fixed blades as well as in moving blades.

65) The critical pressure ratio for gases is